There's also Bocker, a minimalistic Docker implementation in 100 lines of bash¹.<p>[1]: <a href="https://github.com/p8952/bocker" rel="nofollow">https://github.com/p8952/bocker</a>
I presented the thinking and summary of this at PyCon AU. Here is a recording of the talk --
<a href="https://youtu.be/I326bpbdvJo" rel="nofollow">https://youtu.be/I326bpbdvJo</a> - (tonybaloney)